researcher wants to investigate the effectivness of a new anti-wrinkle facial serum. she randomly assigns participants to group A or group B. Group B is given a vial containing a placebo serum while Group A is given and identical vial containing the serum actually being tested. which group is serving as the experimental group?
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1. A pharmaceutical company wants to test the effectiveness of a certain drug on its ability to decrease blood pressure. The company divided the participants into two groups. One group received the drug and the other group received a placebo. All other aspects were the same. The group that received the placebo is the: experimental group. hypothesis group. control group. observation group. variable group.
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